Other (Income) Expense (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2009
Other operating expenses [Line Items]
Other Nonoperating Income (Expense)	$ 1,069	$ (338)	$ (4,121)
Other Income [Member]
Other operating expenses [Line Items]
Other Nonoperating Income (Expense)	(521)	(341)	(357)
gain loss on sale of asset [Member]
Other operating expenses [Line Items]
Other Nonoperating Income (Expense)	(764)	(909)	(201)
Investment Income [Member]
Other operating expenses [Line Items]
Other Nonoperating Income (Expense)	(364)	(177)	(646)
Interest Income [Member]
Other operating expenses [Line Items]
Other Nonoperating Income (Expense)	(403)	(776)	(319)
Foreign Currency Gain (Loss) [Member]
Other operating expenses [Line Items]
Other Nonoperating Income (Expense)	4,230	4,339	142
Rents And Royalties Income Loss [Member]
Other operating expenses [Line Items]
Other Nonoperating Income (Expense)	(817)	(863)	(1,033)
Legal entity realignment [Member]
Other operating expenses [Line Items]
Other Nonoperating Income (Expense)	0	0	1,860
RegistrationExpenseEuronext [Member]
Other operating expenses [Line Items]
Other Nonoperating Income (Expense)	0	0	923
gain loss on insurance recovery [Member]
Other operating expenses [Line Items]
Other Nonoperating Income (Expense)	(292)	(1,611)	(4,490)
Non income tax related (benefit) expense [Member]
Other operating expenses [Line Items]
Other Nonoperating Income (Expense)		$ 0	$ 0	$ 0